Expanding cylinder mold and dandy roll for paper-making machines



Dec. 9, 1924- W. E. K. TROTMAN EXPANDING CYLINDER MOLD AND DANDY ROLL FOR PAPER MAKING MACHINES Filed Feb. 13, 1922 5 Sheets-Sheet 1 w. E. K. TROTMAN EXPANDING CYLINDER MOLD AND DANDY ROLL FOR PAPER MAKING MACHINES Filed Feb. 15, 1922 5 Sheets-Sheet 2 219 0 4 5. 6 TEorflw/V Dec. 9, 1924. 1,518,712

w. E. K. TROTMAN EXPANDING CYLINDER MOLD AND DANDY ROLL FOR PAPER MAKING MACHINES Filed Feb. 13, 1922 5 Sheets-Sheet C5 Dec. 9, 1924- 1,518,712

w. E. K. TROTMAN EXPANDING CYLINDER MOLD AND DANDY ROLL FOR PAPER MAKING MACHINES 7 i/llgiFj-b. 13, 1922 5 Sheets Sheet 4 ii? 6 fl am 21 y zo 2o 20 20 20 20 WWZW r r J J 2 J (fins/r752, 7 7 7 11 5 A? 7E07fl 9/V Dec. 9, 1924- 1,518,712

w. E. K. TROTMAN EXPANDING CYLINDER MOLD AND DANDY ROLL FOR PAPER MAKING MACHINES Filed Feb. 13, 1922 5 Sheets-Sheet 5 Patented Dec. 9, 1924.

PATENT OFFICE.

WILLIAM EDWIN KNOWLES 'raorMAN, or wooD GREEN, ENGLAND.

EXPANDING CYLINDER MOLD AND/DANDY ROLL non rum-MAKING MACHINES.

Application filed February 13, 1922. Serial No. 536,318.

To all whom it may concern:

Be .it known that 1, WILLIAM EDWIN KNowLns TROTMAN, a subject of the King of Great Britain and lreland, and a resi- -dent of Wood Green, county of London, England, have invented a certain new and useful Improvement in Expanding Cylinder Mold and Dandy Roll for Paper-Making Machines, of which the following is a specification.

This invention, which relates to expanding cylinder molds and dandy rollers for paper-making and other machines, has for its. object to provide expansibl'e cylinder molds and dandy rolls which will not only take up any slack occurring in the metal gauze'covers thereof in already, quick, and

' facile manner, but can also be expanded to roll.

suit gauze covers of various diameters, a

much greater range of expansion being obtainable than heretofore has'been posslble.

A further advantage obtained is that repairs necessitated to the longitudinal bars of the cylinder mold or roll can, except in the case of dandy rolls, be efl'ected without removing the roll from its bearings and transporting same en bloc, as has been requisite ing block, slidably but non-rotatably arranged, one at each end of the roll, said bearing blocks being mounted on a longitudinally and centrally arranged spindle, provided with screw means to permit of said bearing blocks having the required amount of travel thereon towards or away from each other in order to expand or contract the Each of the lon itudinal bars aforesaid is formed with a ange at its ends, inclined to the angle of the conical bearing blocks, and upon-which bearing blocks said flanges rest and are adapted to slide. As said bearing blocks are made to approach one another, the flanges iof the longitudinal bars slide up the inclined surfaces of the blocks and correspondingly iaise the longitudinal bars with which they are connected and consequently the roll may be brought to the diameter required. For rigidity, the inclined flanges above mentioned may form part of a flange formed along the lower edge of the longitudinal bars, which may be of any shape in cross section so long as the inclined flange portions are retained, leaving fins or ends to fitin the slots of the bearing blocks;

Suitable means are provided for locking the bearing blocks in required positions, and, if required, the longitudinal bar may be divided at any desired portion of their length,

and the divided ends supported in intermeditudinal bars aforesaid upon which the gauze coversare fitted, and such spiral is constition of arc form with radialprojections from its inner circumference suitably slotted to fit upon the correspondingly shaped uptilted by sections, each comprising a rim porper part of one of the longitudinal bars of l the roll, so that, when placed in position with their ends contiguous, they are ar-. ranged in spiral formation.

The preferred manner of attaching the gauze covers to the roll, when of large'size,

whereby is obviated the costly and usual manner of sewing the edges of the same together to make them in cylindrical form,

and whereby the operations of fittingthem on, and removing them from, the roll are much facilitated, is to remove one of the longitudinal bars of the roll and substitute therefor what is termed a double rack, and to bind the opposite longitudinal edges of the gauze cover each to a metal strip stamped out at spaced intervals throughout its length'to form clips or hooks.

' The racks aforesaid are of ladder-like form and comprise two parallel metal strips extending the length of the roll and provided with a fin at each end for engagement in the slots in the conical bearin blocks vacated by the abstracted longitudinal bar,

and having inclined flanges for riding upon the coned surface of the bearing blocks, said o l a strips being connected by wires or rods (m.

the manner of rungs of a ladder) at suitable spaced intervals. This rack takes the inner COVBI'. x

A second, but narrower, ladder-like rack is fitted upon the first mentioned rack and is adapted to take the second or outer cover.

The covers, which may be rolled to facilitate transport and storage, are fixed upon the roll by first attaching by means of its clips or hooks one edge of the inner cover to the transverse wires or rods of the under or first mentioned ladder-like rack, then passing the cover around the roll and similarly securing its outer edge to the rack.

The outer cover is similarly afiixed to the upper or second mentioned ladder-like rack.

By expanding the roll, said covers are rendered taut and held securely, while as, in the course of use,,they slacken, by further automatic expansion of the roll, any slack is taken up.

In order that the said invention may be the more readily understood, reference is to be had to the followingdescription and accompanying sheets of drawings, wherein z- I the manner inwhich the longitudinal bars Figures 1 and 1 are side views of a cylinder or roll constructed in accordance with the invention, the gauze cover being partly broken away.

Figures 2 and 2, are longitudinal sectional views of said cylinder or roll, only two of the longitudinal bars h'eingshown.

Figure 3 is a vertical sectional view on line 1, 1 of Figure 2. I

Figure 4 is a vertical sectional view on line 2, 2 of said Figure 2.

Figure 5 is a perspective view of the ferred form of longitudinal bars.

Figure-6 is an inside view illustrative of preare connected together to form a resilient circle of bars.

Figures 7, 8 and 9 are views illustrative ofthe manner of forming the spiral, Figure 7 being a sectional View through one of the longitudinal rods; Figure 8 a fragmentary side view thereof: andF1gure 9. a fragmentary plan view showing the positions of several rim portions of art: form on two adacent longitudinal bars.

Figures 10, 11' and 12 are diagrammatic sectional views illustrative ofvarious cover locking means.

Figure 13 is an end view illustrative of 4 the means for automatically taking up the slack of the cover;

Like numerals of reference indicate corresponding parts in the several figures.

Referring now to the drawings and to Figures 1 to tthereof, 3 represents the spindle of the roll, 4, 1 the bearing blocks slidably but non-rotatably mounted on said spindle 3, said blocks having inclined or coned surfaces 5 with slots 6 therein for the reception of the ends or fins 7 of the longitudinal bars 8 over which takes the gauze cover 9, the same being tautened by moving outwards the longitudinal bars 8 by the following means To the hollow base 10' of each block 4; there is fixedly secured, by any suitable means, an externally threaded sleeve 11, the same being slidable but not-rotatable on the spindle 3, that is to say, the sleeve 11 is provided with longitudinal slots 12 in which take the arms 13 of a spider 14 fixedly and non-rotatably mounted on the, spindle 3.

Engaging with each sleeve 11 is an internally threaded cap or nut 15 rotatably mounted on a reduced portion 16 of the spindle 3, and held in position thereon. by means of acollar 17 fixedly secured tosaid spindle 3, so that by rotating the caps or nuts 15 aforesaid, the sleeves 11, which are oppositely threaded, i. e., one right-handed and the other left-handed, are caused to move towards one another, carrying with them the bearing blocks i whose inclined or coned surfaces 5 engage the undersides of the flanges 18 of the longitudinal bars 8,

whose preferential form is, as shown in Figures 1, 2 and 5, of an L-shape, the flanges 18 of said longitudinal bars Shaving 1nclination as the surfaces 5 of the blocks 4, so that as the blocks 4 approach one another,

said flanges 18 of the bars 8ride up the surfaces 5 of the blocks 4, moving outwards the bars 8 till the required degree of tautness is imparted to the cover 9, the nuts or caps 15 being then, if desired, locked in position by means of spring pins 19, carried by the collars 17, engaging in holes in said nuts or caps 15, or other-suitable or appropriate means may be employed.

To render the circle of longitudinal bars 8 resilient, so that they will, on' the screw-;

ing back of the sleeves 11, all move inwards, each of said bars 8 is on its underside provided with eyes or the like 20, Figures 2 and 6, and the eyes or the like 20 of one bar 8 are connected by springs 21 to the'eyes or the like 20 of the adjacent bar 8, thus allowing of the easy disconnection and removal of a bar 8 when required.

Referring now to Figures 7, 8 and 9, il-

lustrative of the expansible spiral, the same consists of sections 22, each comprising arim portion of an arc-with radial protections 23 slotted to fit on the correspondingrods or rungs for said str ps; 28, 28 are the metal strips for the outer cover 9, and 29 are the rods or rungs for said strips. 7

The ends of the inner cover 26 are hooked. by their clips 30, to the rods or rungs 27 of this double rack, whilst the ends of the outer cover 9 are hooked, by their clips 31, to the rods or rungs 29 of the metal strips 28, the metal strips and 28 being carried by suitable brackets or the like mounted on :2 iongitudinal bar 32. a

In Figure 11 there is shown an alternative means for securing the cover. In this form the longitudinal bar 32 has fitted thereon plates 33, in which are fixedly mounted upper and lower longitudinal rods 34, respectively, the outer cover 9 being secured to the rods 34 by hooks 36, whilst the inner cover 26 is secured to the rods 35 by means of hooks 37.

In Figure 12 is shown a further alternative means for securing the cover, that is to say, the longitudinal bar 32 has attached to it, by any suitable means, side bars 38, in which are formed upper and lower inclined slots, in which are respectively hooked the returned ends 39 and 40 of the outer and inner covers 9 and 26.

To automatically take up any slack of the cover of a roll, one end of a short length of chain 41, Figure 13, is fixedly secured to the cap or nut 15 of the screwed sleeve of a hearing block 4, said chain being partly wrapped round said cap or nut 15, and its free end connected to a spring 42 secured in any suitable manner to the spider 14 of the roll, so that on any slackening of the cover, the spring 42 automatically pulls round the cap or nut, causing inward movement of the bearing block, and outward movement of the. longitudinal rods. It is to be understood that this arrangement obtains at each end of the roll, but in opposite directions to suit the threads of the sleeves, or an arm fixedly carried by the nut or cap may be employed in lieu of the chain, the free end of said arm being connected, by a spring, to the spider, or any other suitable means may be employed for automatically turning the nut or cap to take up the slack of the cover.

If desired, the caps or nuts 15 may be provided with teeth to engage in the links of the chain 41.

To remove the gauze cover or cylinder from off a dandy roll, the roll is removed bodily from its hear ngs. and one of the cover rings 43, Figures 1 and 2, of the roll is taken off and the caps or nuts 15 turned in reverse direction to move the bearing blocks 4 away from one another, so allowing the longitudinal bars 8 to move inwards. wilfiereupon the cover 9 can bereadily slipped o I claim 1-- 1. An expanding roll, for cylinder molds and dandy rollers for paper-making and. other machines, characterized by hearing blocks slidably mounted on the spindle of the roll, inclined surfaces to said blocks, slots in said surfaces. longitudinal bars arranged in spaced relation to one another in the form of a circle with their ends supported in said slots, flanged ends to said longitudinal bars inclined to the angle of the bearing blocks,

and screw means for imparting the required amount of travel of said blocks towards or away from one another to expand or contract the roll.

2. An expanding roll, as claimed by claim 1, characterized in that the bearing blocks are slidably but non-rotatably mounted on the spindle, and that the screw. means consists of an externally threaded sleeve, slidably but non-rotatably mounted on the spindle and fixedly connected to each bearing block, and a cap or nut rotatahly but not slidably mounted on said spindle, and screwing 011 each of the sleeves, rotation of said caps or nuts eflecting the movement of the bearing blocks towards or away from one another according to the direction of rotation of said caps or nuts.

3. An expanding device for cylinder molds and dandy rolls including a spindle for the rolls, bearing blocks slidably mounted on the spindle, at each end of the roll, a plurality of longitudinal expanding bars arranged in circular spaced relation and having their portions cooperating with said slidable bearing bloc-ks whereby relative movement of the latter on the spindle will cause the bars to perform their expanding function, and springs connecting the said expanding bars for resiliently holding the same together.

4. An expanding device for cylinder molds and dandy rolls including a spindle, cooperating bearing blocks having inclined surfaces slidably mounted on said spindle, a plurality of resiliently connected longitudinally arranged expanding bars disposed in circular spaced relation and having inclined end portions for cooperating with the inclined portions of the bearing blocks, screw means for imparting movement to said hearing blocks to expand or contract the roll, and means for automatically operating said screw meansto maintain the expanding bars in operative position.

5. An expanding device for cylinder molds and dandy rolls including a spindle, cooperating bearing blocks having inclined surfaces slidably mounted on said spindle, a plurality of resiliently connected longitudinally arranged expanding bars disposed in circular spaced relation and having inclined end portions for cooperating with the inclined portions of the bearing blocks, screw means for impartin movement to said bearing blocks to expan or contract the roll, and means for automatically operating said screw means to maintain the expanding bars in operative position, said automatic means comprising a flexible member connected at one end to said screw means and embracing a portion of the periphery thereof, and a spring connected with the free end of said flexible connection.

6. In an expanding roll of the character set forth and having a cover means for securing the cover to the roll, said means com- 10 prising a longitudinal bar, plates fitted thereto, rods fixedly mounted in said plates, and hooks carried by'the cover and attached to said rods.

In testimony whereof I have afiixed my 15 signature hereto this 5th day of J anuary, 1922.

WILLIAM EDWIN KNOWLES TROTMAN. 

